Drag bucket



W. LEHMAN DRAG BUCKET Filed May 3, v1930 Feb. 9, 1932.

' INVENTOR.

@Y ,9 @mq ATTORNEYS.

Patented Feb. 9, 1932 WERNER LEHMAN, OF kSU'lI-I MILWAUKEE, WISCONSIN DRAG BUCKET.

Appneation mea May 3,1930. serial no.'449,e62.

My invention relates to new and useful improvements in drag buckets.

Drag buckets for dragline excavators are well known in the excavating art. They are characterized by having a hoist-rope, which divides above the bucket and is' pivoted to,

two supports which project from the sides of the vbucket well behind its center of gravity; a drag-rope, which divides in front of the bucket and is secured to two clevises on the V front edges of the sides of the bucket, above and in front of the digging teeth and a. dumping rope which extends from a point on the drag-rope, over a sheave on the hoist-rope, and thence to an anchorage on an arch at the top ofthe front of the bucket. During hoisting, a slight tension in the drag-rope, is exerted throughthe dump rope to hold up the front end of the bucket against dumping. A. slackening of the dragsrope permit-s dump- In the course of devising a proper means of attaching to such a bucket the gate of U. S. Patent No. 1,490,387 to Hansen, I discovered that the means devised by me for that purpose proved to be also an'ideal means for attaching the hoist-chain, even in the absence of the Hansen gate. Such ideal means is hereinafter set forth.

Accordinglyk it is the principal'object of the present invention to provide idealmeans for the attachment of the hoist-chain of .a drag bucket, which at the same time will provide for the ready convertibility into the Hansen type bucket. It is tcbe understood, however, that I do not intend to' have my invention limited to use in connection with the Hansen invention, as my invention is obviously a marked improvement in itself.

In addition to my principal object, I have worked out a number Aof novel and useful details, which will be readily evident as the description progresses.

Myinvention consists inthe novel parts, and in the combinations and arrangements thereof, which are defined in the appended claims; and of which one embodiment is exemplied in the accompanying drawings,

which are hereinafter particularly described and explained.

rotating on the boss 11.

Throughout the description, the same reference number is applied to the same member or to similar members. v

Figure 1 is a side elevation of my device in K position on the yside of a drag bucket. 'K55 Figure 2 is a vertical section thereof, taken along the line 2-2 of Figure 1, and including a part of the bucket wall.

Referring to the drawings, it will be seen that 10 is the wall of the bucket. Projecting 60 laterally from this wall is a boss 11, supported by flanges 12, 18 and 14, and having a recess 15 thereunder, on the inner surface ofthe bucket. This recess fullls the dual purpose of preventing the bolt 28 (hereinafter re- 65 ferred to) from projecting into the cavity of the bucket, and of preventing the occurrence of any undue thickness of metal incast-ing.

' At the base of the boss 11, there is an annular abutment `16. '70

The boss proper is tapered, and is in crosssection a: square, with rounded corners, although many other cross-sections would be satisfactory to my purpose, which is to prevent the cap` 17 (hereinafter referred to) 75 from wearing the boss by rotating thereon.

Inthe claims I shall accordingly employ the term non-circular to mean any cross section such as will prevent thecap 17 from I provide a cap 17, having an inner surface exactly corresponding to the tapered outer surface of the boss 11. Thesesurfaces are, however, so related, and the relative depth of cap and boss are such, that the cap will not abut either the head of the boss 11 or the abutment 16, even when firmly seated.

Through the head of the cap 17 there is a holerlS, terminating in a hexagonall recess 19. Aligned with this hole-18,'there is a hole 20 90 inthe boss 11.

The cap has an annulaiabutment 21. y The outer surface 22 of the cap is cylindrical.

The terminal link ofthe hoist-chain takes the form of a yoke 23, which fits loosely over this surface 22, between the abutments 16 and 21, and is not quite thick enough tobe clamped between these abutments. It is evii dent that I might employ, in place of yoke 23,

a specialized terminal link.

The upper end 24 of the yoke is forked for the insertion of the next link 25 of the hoist-chain. This link is held by a pin 26, which in turn is held by a pin 27.

Through the aligned holes 18 and 20, of the cap 17 and the boss 11 respectively, there passes a bolt 28, the head of which rests in the hexagonal recess 19, and the nut Q9 of which rests in the recess 15. The nut and bolt clamp the cap 17 firmly to the boss 11.

The cap 17 should preferably be made of very soft metal.

As a result of my device, no wear at all results to the non-replaceable boss 11, most of the wear comes on the inexpensive and readily replaceable cap 17, and but little Wear on the relatively inexpensive yoke 23.

Attachment of chains can be effected with great rapidity and simplicity.

Having now described and illustrated one form of my invention, I wish it to be understood that my invention is not to be limited to the specific form or arrangement oitl parts hereinbefore described, except in so far as such limitations are specified in the appended claims.

I claim:

1. A device for attaching the hoist-chain to a drag bucket, comprising: a tapered noncircular boss, projectingT laterally from the side of the bucket, and having a recess thereunder on the inside of the bucket, and a hole therethrough, and an annular abutment at the base thereof; a cap of softer metal than the hereinafter described yoke, having its internal surface tapered to fit the external surface of the boss, and having its external surface cylindrical and headed by an annular abutment, and having a hole through its head in alignment with the hole in the boss and ending externally in a polygonal recess to fit the head of a bolt; a yoke, swivelly held between the two abutments` and having a cylindrical hole to fit over the external cylindrical surface of the cap, and having means for removably and pivotally attaching a chain thereto; a bolt for insertion through the holes in the cap and the boss, the bolt head being fitted to the polygonal recess of the cap; and a nut for securing the bolt, and for positioning in the recess beneath the boss.

f2. A device for attaching the hoist-chain to a drag bucket, comprising: a tapered noncircnlar boss, projecting laterallyY from the side of the bucket` and having a recess thereunder on the inside of the bucket. and a hole therethrough, and an annular abutment at the base thereof; a cap for the boss, having its internal surface tapered to fit the external surface of the boss, and having its external surface cylindrical and headed by an annular abutment, and having a hole through its head in alignment with the hole in the boss and ending externally in a non-circular re- 5 cess to fit the head of a bolt; a yoke, held between the two abutments, and having a cylindrical hole to fit over the external cylindrical surface of the cap, and having means for removably and pivotally attachin a chain thereto; a bolt for insertion throng the holes in the cap and the boss, the bolt head being fitted to the non-circular recess of the cap; and a nut for securing the bolt, and for positioning in the recess beneath the boss.

3. A device for attaching the hoist-chain to a drag bucket, comprising: a tapered noncircular boss, projecting laterally from the side of the bucket, and having a recess thereunder on the inside of the bucket, and a hole therethrough, and an annular abutment at the base thereof; a cap for the boss, having its internal surface tapered to fit the external surface of the boss, and having its external surface cylindrical and headed by an annular abutment, and having a hole through its head in alignment With the hole in the boss; a yoke, held between the two abutments, and having a cylindrical hole to fit over the external cylindrical surface of the cap, and having means for attaching a chain thereto; a bolt for insertion through the holes in the cap and the boss; and a nut for securing the bolt, and for positioning in the recess beneath the boss.

4. A device for attaching the hoist-chain to a drag bucket, comprising: a tapered noncircular boss, projecting laterally from the side of the bucket, and having a hole therethrough and an annular abutment at the base thereof: a cap for the boss. having its internal surface tapered to fit the external surface of the boss, and having its external surface cylindrical and headed by an annular abutment, and having a hole through its head in alignment with the hole in the boss: a yoke, held between the two abutments, and having a cylindrical hole to fit over the external cylindrical surface of the cap, and having means for attaching a chain thereto; a bolt for insertion through the holes in the cap and the boss; and a nut for securing the bolt.

5. A device for attaching the hoist-chain to a drag bucket, comprising: a tapered noncircnlar boss, projecting laterally from the side of the bucket, and having a hole therei through and an annular abutment at the base thereof; a cap for the boss. having its internal surface tapered to fit the external surface of the boss, and having its external A surface cylindrical and headed by an annular abutment, and having a hole through its head in alignmnet with the hole in the boss and ending externally in a polygonal recess to fit the head of a bolt; a yoke, held between the two abutments, and having a cylindrical hole to Fit over the external cylindrical surface of the cap, and having means for attaching a chain thereto; a bolt for insertion through the holes in the cap and the boss, the bolt head being fitted to the polygonal recess of the cap; and a nut for securing the bolt.

6. A device for attaching the hoist-chain to a drag bucket, comprising: a tapered noncircular boss, projecting laterally from the side of the bucket,l` and having an annular abutment at the base thereof; a cap for the boss,'having its internal surface tapered to fit the external surface of the boss, and having its external surface cylindrical and headed by an annular abutment; a yoke, held between the two abutments, and having a cy-v lindrical hole to it over the external cylindrical surface of the cap, and having means for attaching a chain thereto; and means for securing the cap firmly wedged upon the boss.

7. A device for attaching the hoist-chain to a drag bucket, comprising: a non-circular boss, projecting laterally from the side of the bucket; a cap for the boss, having its internal surface shaped to fit the external surface of the boss, and having its external surface cylindrical; a yoke, having a cylindrical hole to t over the external cylindrical surface of the cap, and having means for attachinga chain thereto; means for securing the cap upon the boss; and means to prevent the yoke from sliding off the cap.

8. A device for attaching the hoist-chain to a drag bucket, comprising: a non-circular boss, projecting laterally from the side of the bucket; a cap for the boss, having its internal surface shaped to fit the external surface of the boss; means for securing the cap upon the boss; and means to prevent Whatever part of the chain is placed over the cap, from sliding therefrom.

In testimony whereof I aix my signature.

WERNER LEHMAN. 

